Solution
= Solution
The <Laurent series> is
$$
e^{1/z}=\sum_{k=0}^{\infty}\frac{1}{k!z^k},
\qquad 0<|z|<\infty.
$$
\b[Thus zero is an essential singularity.]
= Solution
The <Laurent series> is
$$
e^{1/z}=\sum_{k=0}^{\infty}\frac{1}{k!z^k},
\qquad 0<|z|<\infty.
$$
\b[Thus zero is an essential singularity.]